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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b651709c4c02672a83b4ec874c92e3ff59817752cd1b1a605feaae206e66511d' 
  AND token = 'L6CG/mjcFl9kMFmYbLE1VhhojZC8u5A0mFkh6sXyli4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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