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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '709b231e5b47153f5863f039feeb7ec3fee0591638f3d9ba5bc34f86d9cba2b3' 
  AND token = 'PnLdtYXpYxWGJ6l1c69Q6sxQI7MnuJtotTUaiQwTqo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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