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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd0a467f1cad1a4165d54c9caa3448b7b66ce144b29e102e3b2490e1c0512634' 
  AND token = '1zllCl27EP8R2ZSZvMlcpZnND2jgNLo8ENnJG26bMYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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