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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b965854f3544febb6fc110b81ba1aa0b3c79fc74d48f916b3948812dd5adb3ad' 
  AND token = 'F1Aygni97DpcFaUaaWz2E1MA14X8xBbsw5zyT+tB5Ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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