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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cba92f220f0b818443c3ef9c336e8ad8f748d145c29750976eab0b57da76e407' 
  AND token = 'dktBO2TETM1OpwjDG7GUvmWzMSMo7i2ka78X9sRnSlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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