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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '44380574f63b942772c98cc62fe89a98d7e9fc95ae28dea6c4c9d80199f24b6b' 
  AND token = 'bNFFHtQQSgkZdDLjqbKlwPbTQgRlTwVyenUS36fuXqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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