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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dcc09e4c8cd85095b6416642bc0a184fb3ae7d7d7aec64c281c8d2b4f43dc05f' 
  AND token = 'mY+Z7CfDbjTbu2tabDWtbjAsnFFiYMW1cFPrIx96Qgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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