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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34c4c3206a6c860d555a4e6332ec84515943a29e9e2b7e660c237e7153d35b09' 
  AND token = '1UnhZYiS1Drjq4ZAtejNKTSbv5LzO+RaCXuBi/lnu90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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