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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '945325fafaa70bf311b9e22db103bb702413fe47ad3e1582c5930027db88f84f' 
  AND token = 'abfEU3XjeDhYTjWwFaH/g6v6HDgM6Rcycw2Wox8/RUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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