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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1bb622de44ab768dba53c6bda43d5a8fa6e0715935897985a725e328969bb1d2' 
  AND token = 'A2YVs06tfOoL7lmFdbwjHT+Ek4IoVOjJoEt5ouQHKqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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