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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cfdadf882c4dd8a811a73e682dd2e61795b7fcac5d6f82bdc18aefe60e61aa0b' 
  AND token = 'WTUgCTBJialnV8Nv9ZsusfIUveUYeAjAepFvY1tQUek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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