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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e91748f7aa50d5ca89e53c62a38dac495cbeabd72d9b36b07a4b2164f245190' 
  AND token = 'Yvv342Nas97lXWb4+L8CrGoyilObHBtefzVMJkwlQjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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