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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c1d05a3d7ae1b6ab905b03d08a937543915da64e04c04e94bce7dc8cb15a89f' 
  AND token = 'M0o1yi9FHzPu4V9h9QA2VaNBceC+nqON7Kubk0iaSnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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