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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e6a6178293c81d1b204b49cd56d35fae8a47d9f2c51eeeb2d5df7fb263d8b2f' 
  AND token = 'r2BxD7tAzHGiKAZeonFStEabSfKVy6Y4uhyZFWQCI5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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