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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '161575ee01abaaeb05fd17ced1d9f56f838ae1d9d451b698ff2e8c0ac5d1c5cc' 
  AND token = 'tOarM4TWdfeT93bPOPrI8tQF3HmWIapIZ7pPLDDq0Bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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