SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ae88369dd627cc4e7f2d43d7270fda19c87b5defc238a207c44c7c7f6621b0b' 
  AND token = 'B+/0SjGPRgla/o01bKZJTD2Pwcnd0mVF6V+We6Z6uj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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