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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68c1e1668c9133b19b3b25fc1dd4ec19e1607b98e54e8108fe2420a05ee65dba' 
  AND token = 'SdieQOE1zZzFPoZhn6hEhiZkUwyhwW30P2g5NlMr/sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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