SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ead953121ffe5c458d5a2b78b58535aab0583266b9b33b78c06c1b9179a79ee' 
  AND token = 'TREU5UAw0HZ9ejmQvz2CUHohqdMe7LYs4FKHfQH5ZQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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