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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0414293bb7c133071532ad14913c6bd732ab36c7e3930104049004725cb1cb92' 
  AND token = 'jqS5XwzC31Ch+7wUejNuwF/q3Has7nd9/i4LoqaX4/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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