SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aff96e2af61b162b45903494b5d63c0ef89516233d2f89529a0868d3714cb4b2' 
  AND token = 'm60Tbzkoz8yIvZ/Mt3sXO8YBbqhL1fq11KoJcud5tmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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