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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b284083e6ec79bf4354bfca6d98cf71ef6d77ee5b93ab34cf022745937854e4' 
  AND token = 'r2r009Tl0TbH+TtKAPzkrbdvwhds5xasqRDl/SpvdIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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