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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00fe8d864f7e5c5a73f173d2e16c594e84c923ce14fdf2e2d4c406cf6af4f52c' 
  AND token = 'hHXNMPn8Iq7yQOMpBX1yUMF3MQq6TOTlEgd9risw8Ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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