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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '60304b284ee20e2516275be92aeaf9289b85037b9b85787594b4796b8df3ceb7' 
  AND token = '3iN6xTwjZ3AwX0TTKbNffKDH+mLyDbGuAaphN5uOe6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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