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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52f430d1c6de1a3e95c8330a666e30d17e21e258ac634db492724164f61dd94f' 
  AND token = 'hlDvXakxqKN0Jh9U1X+MaOsOEU/bIcdd+Swjyn2BcVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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