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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca3ba1264bb8ebda19deda1c9759e533c678c249c66de92aa8aacfed1fb6e5e3' 
  AND token = '7CbosgJVpaOcGRyl37ffEMopYe4LBtDh5+M78up7/gI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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