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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ff74cf0a0f3a40260cf3287d81f22746fa187dea20ea624212ba1d29dd6c241' 
  AND token = 'pVaPc+32ldmPo5Iw1LJtv9tp9LoZoXOI9PzkM5B0KJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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