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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c08daad0e864c280b66674b1d89f4ac42e1266eb64469c08c9814992d0c5e633' 
  AND token = 'bdXvwWQ25mGVASbH8twtgiCC+80HwuPxMjwIyedTVlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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