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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '92f5a89a3d31cddda5ee3b517650cefdc1c1693edbd255b92ab654007a95f105' 
  AND token = 'YC3Zty0cts2oPt9yTe373pqFvRtU+hDONrW0X4nARfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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