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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fefb3d6d1520fe57007978160832cc7f5cc451f64f9aa56d2f5964debc1f7180' 
  AND token = 'U5BtO2Kogfko7BKU/kbpBlviTxMDzVX95eoLTcLkzQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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