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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '166f21e4ce525040ea5378a595351f9e80c4607e292d5f5c7d479ddb83c425c5' 
  AND token = 'vc+nX785AyDX7zxSyY/hGrafjuHODuB8HDwAe/WreO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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