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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '550e1179daccb139469242beefd2fc328f1f859361a02cca1b1c38978aa88811' 
  AND token = 'NRARyMGDUuteNYWETFd94ZRklbtEhTEwIECTT7ZiZ40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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