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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '82f92341773579d591490e433f8ac2874edb5cceadd3d4eec0eada5dd3062f14' 
  AND token = 'SOKF7svTd5mRxn3h7WL5iUN06Fj4EDI0ux0yvPw7R+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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