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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1fcc47e881d649612744ea24878e97d0ce1009e1495202080e268ea782aa9f6b' 
  AND token = 'hn3W942UJsT5pH3GBAafzhLo12oqWDteoblIqInbiUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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