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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d0642cacf0fb4d281ad27285f8be2603ff377082aff0ccd9b767cdf72caf749' 
  AND token = '69NSQ567bLH6XyA4cNxq6RjyXDCdeVGS2ZHocWZ0Ufs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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