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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4316cc3e84d8834f1623eb621b722c836a59298f1f9beb7889be346cec27348' 
  AND token = 'MNrKoTrGejzIfETjhRzAyH7QxnG9x4z9crFL2JCMYog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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