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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e5fdce82ebafce058e5e3f49bb2f2435aaaaf6def7f8878200d313fc3d0d793' 
  AND token = '9pLc5Of8wh+ZsfMNA8LU5sNXvIWivUTEhm9ZqVRq84g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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