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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '49e9adfc1a8534d2fd3dbc775b0b65ce7dcc22b3ee587ffaf2af0d2ea62eda8f' 
  AND token = '3h6wLFFWhlAfw1yDtK50vlqcz5I9ikuKPoRrPt9wyN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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