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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47f77238816225fe9548ef21c9da9fd772ed27907728d3179ba8b2a8b5f0a39a' 
  AND token = '/v+cYimcv6CIyP16T450EwXOFhg7WsjWFzoOx7kRt90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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