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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e0b5321c7d04eb264bd3b935640892386e5544b20c72eb4530eaef867729a1e' 
  AND token = 'ZYSeK2Npi0CbFxOJKwHVO2p2Lxrb0vf8W0dEjYZnqho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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