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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5c45e1af2754e5530bf86d1ffd0c875a20fe088cfee99e23d83e35bf299212e' 
  AND token = 'xXzkdqcjpzjDk/Ao8CcEU/6wTIlKMPYHQsg86R2Qfp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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