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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9fdbc254909a4024dae997bc0c55d69cc97e884fe647d56b1dc1f1d15900c4a' 
  AND token = '+NOfrfzXCix5od1wf8lao5iZ7Fa1geyJrv0lrBeLi0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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