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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd8c030965e27bbd2c993d14ec1d748edec0c51ca02b22cd4a99815f49acfc4c3' 
  AND token = '/pfrP1NX/2hBkH/yekS9R+0Nzzi5jZZGU3s03FrFmYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}