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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d9a8f1ab415f4ab047638db46cadfa60e3bffb1c6614b3c07713f10e74ec447' 
  AND token = '1BmWN4WEmfCKPfQaAgm5BSWNp4eEnXslnYUS/vKtVj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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