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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f0a5c5d6c6509b10cd7be1f4b7fb42e5c36a5f1e34ee04609f2dc475a5baf94' 
  AND token = '+4FOWxphtzoDSyHtaxdCsYfd62kIdISMRK2YnmoJGhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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