SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '65de63c48a81e77f52d279ce923f0a9b22912f3e555106b82388e2b43c497d7f' 
  AND token = '9vyI0eW2TzHIhOx1weroEjnM1KVJgbVR8V1pCGnL2V0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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