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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a8261a146dc3c1427ceb6e8f5f5c20763a6b07e5f1197663254a1420ba94f7e4' 
  AND token = 'nelrZxmQhaEHgBQU7oysUWZO0WyhfKQDkFabA8QXz8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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