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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7f9cfa6e66fb70009d339a448b8a18c3449c31dd95289c1e4f4ceaea5c58fdf' 
  AND token = '64gNbKu1PH/KzxXDiLwDdXucI4SGaVCf+P6BAeoKri0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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