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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b48e6cc899046d77771c7c8008014e5014aad7ee79c123266e81e53405837e25' 
  AND token = 'kua246fMjh1JwjbuLva/5xLG1X7iPzo3kbBbPtuTxJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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