SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37cc96435be8a9e612d7bb9764e16370f19b5be4ef0527649ba71c2f56f025f4' 
  AND token = 'P1HRgZI71dLaoMBOvURsSP33Cj0bKPoKWZVDnyZwH68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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