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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42e80f526ba3aa59cbaf78a6c6a7b86ba17f3adcee2fba9c6dd03d6689280cf8' 
  AND token = 'vLqYREMRpD7khjUPN5oVNtAeWuU9XfHRQh/Sy2s/9zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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