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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aaa47080698cac7267bf65c920d5099f1eaa153b4383fb9c67309a8df019e496' 
  AND token = 'j99+ZDqA9fZSmDMnZTQ8k4la3Obo4nkvkd3kOUy2Mkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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