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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3400b7d7403bb8e4e75fc42d24a29b79200809ad546c68a89bbde3ab3b7a3d8' 
  AND token = 'yYn4kwj6M8kS2UU/3Kd5iEw1HYaxjkr8jFVBSOjqez0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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