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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a8d7d14d04cf4e8fc8cb3ae881860736f15ae063e759b94891331775f664800' 
  AND token = 'I6Wr/m7fZFCWOifRqSUXpyZpjw4OdEhWObp6ZbxXmmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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