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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b014e701c96865a0273eece504e41455decf4c2774f860bd54a32cdd207d7563' 
  AND token = '4p5tZVNqtmPW+QlFLyKZramKT6cojtztajRLLUcvnB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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