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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c9c20fedfcccd8962240e1dc3c8e6985df7d6ff1c29b9e6e2482fa3fc6d59498' 
  AND token = 'vAQ/PDkpFtrRb6Uq2jULdg+HEcxFetATs6InNcUhM2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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