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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d7a9c5d2926d654ebc78c5a2231c716c78662d3575e8534f3cc7a58cd4448b8' 
  AND token = 'E6/eHGi5A5EIGJrBMnpWnlVA+1ZSOIQ1lfR48dYVy2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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