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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd212ec5dedde4917719bee263f3811ee21607bbfaa6bc89a2785e89c1c163f37' 
  AND token = '/pgH5ea/p3ONEiXaY6KZ0pXhNaUhI5yJuhnjk/h7sjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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