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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fdbb76ce27823fb7c10c8e20268e35466f0706a3d5d991c3f01b9a0bc3ea21ad' 
  AND token = 'C0QJc6FxmwkTfNLkfk5UTzlQR07UVcSt8LNjox+U0xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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