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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa1edbb9757ceb57457a92b6c510f384425ba140fd0abb103684be5891c1736e' 
  AND token = 'dlFUA3tU19VGyaXtJD+vzpEGJmoj0mXP11djkD8OxcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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