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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c0338db343c742a1d8b0963178efe078111839ef6e738fa23e09e98c697fc0f' 
  AND token = 'sYDSQmKL5YOrTD+fHovd2Dg7fN11tyBns87pzDR1aIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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