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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8de0ff448849c69f9ae3770b49e6af144c5e032002c500ee6af3915867dadca' 
  AND token = 'Q72fhxwPslvv6r68rDWHRaaehm3E7Sskzo3yhHTgcVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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